Cloth-cutting machine



Jan. 5 1926.

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M. ziAwls'rowsKl CLOTH CUTTING MACHINE Filed Jan. 9, 1922 2 Sheets-Sheet2 Whoa "F art koala,

Patented Jan. 5, 1926 MARTIN ZAWISTOWSKI, or BROOKLYN, NEW YORK.

CLOTH-CUTTING MACHINE.

Application filed January 9, 1922. Serial. N01 527,833.

To'all whom it may concern: V Be it knownthatI, MARTIN ZAWISTOWSKI, acitizen'oftheUnited States, and resident of Brooklyn, in thecounty ofKings. and State of New York, have invented'certain new and usefulImprovements in 'Cloth- Cutting Machines, of which the following is aspecification.

This invention is an improvement incloth cutting machines of the generaltype shown in my prior Patent 1,378,162, issued May 17th, 1921, and inwhicha base slidable beneath the layers of material to be cut carries avertical knife and an electric motor for reciprocating it.

In the machine shown in said patent there is provided a knife guarddisposed in front of the knife and carrying at its lower .end a presserfoot vertically adjustable to a position corresponding to the thicknessof the superposed layers to; be cut. The knife is shown as connected tothe motor by means of a cross-head, a connecting rod, and a crank disk.

My present invention relatesfparticularly to the construction of theseparts, and among the mainobjects are to facilitate the adjustment of thepresser foot 'and cross head guide, and insure proper lubrication of theparts. The invention involves various important features, and isembodied in a preferred form in theconstruction shown in theaccompanying drawings. It is evident that other forms may? be designedwithin the scope of my invention as defined in the appended claims. l

In'these drawings r Fig 1 is a side elevation of a portion of themachine, many of the parts being shown in section,

Figs. 2 and 3 aresections on the lines 2+2 and 3-3 respectively of Fig.1,

'Fig. l is a face view of certain of the parts, including the knifeguard clamp, and

Figs. 5 and 6 are face and end views respectively of the adjustablecross-head guide. 7 V i V The working parts of the machine illustratedare carried 'by a vertically disposed standard 10, the lower end ofwhich is secured to and supported by a base not shown, but of anysuitable construction, as for instance that illustrated in mypriorPatent 1,378,163, issued May 17th, 1921. The standard 10 carries a frame11 at its upper end, a rotary electric motor 12 secured to or mountedinthe frame, and a handle 13 for guiding and controlling the machine.The motor has a shaft 1 carrying a combined fly-wheel and crankdisk 15,and this crank disk is connected to a cross-head 16 by means ofa'connecting rod 17. The cross-head is vertically guided and is connectedto the knife 18 which is vertically movable in a slot or groove 19in thefront edge of the standard '10. In front of the knife is. a verticallyadjustable knife guard 20 having at its lower end a presser foot 21. Thegeneral arrangement and function of the various parts above describedisapproximately the same as that shown in my prior Patent 1,376,162. I v

'As one important feature of my present invention means are providedwhereby the presser foot and knife guard are normally rigidly supportedbut may be easily. and

quickly released to permit the presser foot to automatically rise whenthe knife reaches a portion ofthe cloth or other material'of increasedthickness, as for instance when there is a larger number of layers ofcloth at one point than at another 'As shown the frame or casingincludes a cover member 22 providediwith a groove in the front surfacethereof Within which the knife guard or presser foot carrier 20 isvertically slidable.

Engaging with opposite sides of the guard 20 areapair of wedge member's23vacting as clamps and vertically movable to grip or release the guard.Each wedge member has a straight side-for engagement with the side ofthe guard, and'a'n inclined or converging side movable along a coactingsurface of the supporting-framepart 22. The wedges taper inopposite'directions, so that upon moving one wedge upwardly and theother one downwardly, they may be simultaneously forced into grippingengagement with opposite sides ofthe guard. Likewise,'up0n moving eachin the opposite direction, the guard may be released and permitted todrop by gravity until the presser foot engages with the upper layer ofcloth, or to rise as the; presser foot rides up on toa portion ofincreased thickness. The means illustrated for operating the wedgesincludes a plate 24 mounted to oscillate on a pivot pin 25, and havingcam slots 26 receiving pins 27 carried by the wedges. The pivot 25 has athreaded portion extending into a plate 28 held rigidly to the frame inany suitable manner, as for instance by 4 ing position.

screws, as shown in dotted lines in Fig. 4. This plate serves as a frontwall for holding the wedges in place, and also has slots for guiding thepins 27 during the endwise movement of the wedges. Due to theinclination of the slots 26 it will be noted that oscillating the plate24 in a clockwise direction will tend to lift the left hand wedge andlower the right hand wedge 23, and thus release the guard. Oscillationin a counter-clockwise direction moves the wedges into the opposite orlocking position.

For oscillating the plate the latter is provided with a depending arm 29connected by a link 30 to a lever 31. This lever is pivoted intermediateof its ends, as for instance on a pivot pin 32, and has its free endterminating adjacent to the handle .13, so that it may be readilyoperated to release or grip the guard. A spring 33 preferably ac on thelever to swing it in such a direction as will 1110\(3 the wedges tolock- Thus the presser foot is normally locked, and is released onlywhen the lever 31 is moved against the action of the spring. The instantthe lever is released the spring returns the parts to locking position.It will thus be seen that the presser foot is normally held at thepredetermined and desired elevation, but may be released at any timewhile the machine is in operation, and by a slight movement of the thumbof the hand which gm des the machine. The presser foot when released mayrise or drop as occasion may require, and will be locked in the newposition the instant the operator release the handle-31.

The cover plate 22 of the main frame and which carries the knife guardis shown as being secured in place by a pair of screws 35 of suchcharacter that they may be very readily removed to take off the coverplate, and all of the parts carried thereby. Directly in the rear of thecover plate and ably mounted independently of the cover is thecross-head guide 36. In the rear of this is the non-adjustable crossheadguide 37. The guide 37 is in the form of a tube rigidly supported at itsopposite ends, and extending through aguide openingor passage in thecross head 16. The front edge of the cross-head is beveled and enters agroove in the rear surface of the guide 36, shown particularly in Fig.2. The guide 37 being circular in crosssection permits the front edge ofthe cross-head to lateral to a very slight extent, and

- to accurately center in the groove ront guide 36. Thus no lateral adofthe cross-head is necessar nenr front cross-head guide 18 ad ustabletoward and from the cross head to give the For holding it in propersliding contact.

the guide place and giving this adjus 36 is provided with a pair ofapertures 3839 at each of the four corners thereof. The four apertures38 are threaded to re ceive adjusting screws 40 which may abut againstshoulders or stops 41 in the main frame or casing. The four apertures 39are not threaded, but receive adjusting screws 42 having threadedengagement in the stops 41. Thus the screws 40 may be rotated untiltheir free ends project beyond the inner surface of the guide member 36to the desired extent, to space the guide, and the screws 42 may betightened to hold the guide in place. In other words, the

guide may be adjusted inwardly by loosening the screws 40 and tighteningthe screws 42, while it may be adjusted outwardly by loosening thescrews 42 and tightening the screws The cross-head is secured to theknife 18 in any suitable manner, as for instance by means of a clampingbolt 44, and is secured to the connecting rod 17 by means of a tubularpin 45 inserted from the rear edge of the cross-head and seating at itsinner end, and normally held from removal by the guide 37.

For lubricating these and the other parts of the driving connectionbetween the motor and the knife, the crank disk 15 is provided with agroove 46 in the face thereof toward the end wall 47 of the motorcasing. This end wall has an oil passage 48 extending downwardly towardthe motor shaft 14, and terminating in oppositely facing ports. One ofthese, 49, leads to the ball bearing 50 which supports the shaft 14 andthe other is provided with a short delivery tube 51 extending into thegroove 46. The inner edge of the groove 46 is concentric with the shaft14, but the outer edge is slightly eccentric, as indicated in dottedlines in Fig. 3. The edges of the groove are undercut, as shownparticularly in Fig. 1, so that oil delivered through the tube 51 intothe groove is retained in the groove and tends to move to the point onthe outer edge at the greatest distance from the axis of rotation. Atthis point there is a passage 52 leading into the ball bearing 53 whichsupports the crank pin 54 of the connecting rod 17. This crank pin maybe rigidly clamped to the connecting rod and to the inner race ring ofthe bearing 53. Thus oil introduced through the passage 48 serves tolubricate both of the bearings, even though one of these iseccentrically located and bodily carried by the crank disk 15.

The peripheral wall of the casing is ;provided with a groove located insubstantially the same plane as the rear surface of the crank disk 15,so that oil which may overflow from the groove 46 and which is thrownout radially by the crank disk Will be received in the groove andconducted to a port which leads to the upper end the oil is slowlydelivered to the external surface of the guide on which the crossheadslides. Seine of the oil delivered from the openings 57 flows to theinterior of the hollow connecting pin 45 in the cross head, and this hasradial openings 58 whereby the bearing surface ofth connecting rod onsaid pin is lubricated. Furthermore, the opening which receives the pin45 terminates in an oil passage 59 leading to the knife edge of thecross-head which has sliding engagement with the guide 36. From theforegoing it will be seen that oil delivered through the single passage48 serves to lubricate all of the bearing surfaces of the cross-head,connecting rod and crank disk support, and it is therefore necessary toapply oil at only a singlepcint to insure proper and adequatelubrication.

By means of my improved construction the machine may be kept in goodworking condition with the minimum instructions and attention by theoperator who is ordinarily not skilled in the proper care of machinery.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is 1. A cloth cutting machine having avertically movable presser foot carrier, a guide for preventing lateralmovement thereof, and a pair of vertically movable Wedges in engagementwith opposite sides of said carrier and movable in opposite directionsfor clamping the latter, and means for operating said wedgessimultaneously 2. A cloth cutting machine having a vertically movablepresser foot carrier, a guide for preventing lateral movement thereof, apair of vertically movable wedges in engagement with opposite sides ofsaidcarrier and movable in opposite directions for clamping the latter,means for operating said wedges simultaneously, and means ex tending tothe opposite end of the machine for operating said wedges.

A cloth cutting machine having a vertically movable presser footcarrier, a guide for preventing lateral movement thereof, and a pair ofvertically movable wedges in engagement with opposite sides of saidcarrier and movable in opposite directions for clamping, the latter, andan oscillatory member for operating said wedges simultaneously.

4. A cloth cutting machine having a vertically movable presser footcarrier, a guide for preventing lateral movement thereof and a pair ofvertically movable wedges in engagement with opposite sides of saidcarrier and movable in opposite directions forclamping the latter, anoscillatory member for operating said wedges simultaneousl'y, and apivoted lever for oscillating said member. I v

5. A cloth-cutting machine havlnga vertically movable presser footcarrier, a verticallymovable wedge adjacenttl'iereto for locking orreleasing thecarrier, an oscillatory member for-operating sa1dWedge,-and a'pivoted lever for operating said oscillatory member.

6. A cloth cutting machine having a guiding handle, a vertically movablepresser foot carrier, a vertically movable wedge adjacent thereto forlocking or releasing'the carrier, an oscillatory .member for. operatingsaid wedge, and a member extending to a point adjacent to said handlefor operating said oscillatory member.

7. A cloth cutting machine of the reciproeating knife type, including acrank disk having a crank pin rotatably mounted therein and a groove inthe face thereof opposite to said crank pin, a passage leading throughsaid crank disk from said groove to the bearing of said pin and meansprojecting into said groove for delivering oil thereto.

'8. A cloth cutting machine of the reciprocating knife type including adrive shaft, a crank disk secured thereto and having an annular groovein the face thereof, a crank pin rotatably mounted in said disk, avconnecting rod secured to said pin, a crosshead secured to saidconnecting rod, 2. guide for said orosshead and a casing enclosing saidcrank disk and having a passage for the delivery of oil to said annulargroove, and having an annular groove encircling said crank disk toreceive oil therefrom and. deliver the same to said guide.

9. A cloth cutting machine having a reciprocating knife, a cross headsecured thereto, a connecting rod for operating said cross head, a pairof guiding members for said cross head, and a pin mounted in said crosshead and upon which said connecting rod is journalled, said pin havingits axis intersecting both of said guiding members, one of said guidingmembers having a passage for the delivery of oil therethrough, and saidpin constituting means for de livering oil fromsaid last mentionedmember to the other member of said pair.

10.'A cloth cutting machine having a reciprocating knife, an electricmotor, and connections between said motor and said knife, including acrank disk, a connecting rod and a cross head, said crank disk having anannular groove in the face thereof opposite to its crank pin bearing,and communicating with the latter, and. a stationary oil delivery tubecommunicating with said groove.

11. 'A cloth cutting machine of the reciprocating knife type, includingan electric l GU motor casing having a motor shaft journaled therein, acrank disk secured to said shaft, said disk having a connecting rodpivotaily secured thereto on one side and an annular groove in theopposite face thereof, the outer Wall of said groove being eccentric inrespect to the disk and communicating with said connecting rod at thepoint in the groove of maximum distance from the axis of the disk, andsaid casing I having an oil passage for delivering oil to said grooveand to the bearing of said m0- tor shaft.

Signed at New York in the county of New York and State of New York this15 6th day of January A. D. 1922.

MARTIN ZAWIsT-OWSKI.

